Motor-generator.



No. 702,407. Patented lune l7, I902.

' P. J. COLLINS.

MOTOR GENERATOR.

(Application filed Oct. 11, 1901.,

3 Sheets-Sheet I.

(No Moder.)

Q/v-Mneooao attopwuza v ma NOflRkS PETERS m, PHDYG-LTHLL. WASHINGTON, uc.

UNITED STATES PATENT OFFIoE.

PATRICK JOSEPH COLLINS, OF SORANTON, PENNSYLVANIA, ASSIGNOR OF ONE-IIALFTO CHRISTOPHER G. BOLAND, OF SORANTON, PENNSYLVANIA.

MOTC) R-G EN ERATO R.

SPECIFICATION forming part of Letters Patent No. 70 dated June 1902-Application filed October 11, 1901. Serial No. 78,372. (No model.)

To all whom it may concern: connected by suitable brushes 19 and a cir-Be it known that I, PATRICK JOSEPH OOL- cuit 20 to the generator g. Asshown, the LINs, a citizen of the United States, residing armature andfield are connected in shunt, at Scranton, in the county of Lackawanna,and a rheostat h is provided,by means of 55 State of Pennsylvania, haveinvented certain which a resistance 21 may be inserted in the new anduseful Improvements in Motor-Genarmature-circuit to start the motor orrun it erators, of which the following is a specificaat a speed belowthe normal, and a resistance tion. 22 may beinserted in the field togive a vari- This invention relates to improvements in able speed abovethe normal. The winding 60 to motor-generators whereby several currentsconnected to the commutator 18 is an ordidiiiiering in character may bederived from nary direct-current winding suitably proporthe same machineand the electromotive force tioned for the voltage of the generator 9.In frequency and volume of current may be the drawings only a singlecoil 23 of the moreadily regulated. tor-winding is shown for the purposeof illus- The generator is designed particularly for tration. Upon theopposite side of the armatheuse of physicians,and the currents derivedture (L is arranged a secondary commutator from the machine may beemployed in vari- 24, and upon the armature, within the slots ous waysin treating patients. 15,are arranged secondary windings 25,which In theaccompanying drawings, which illusare connected to the commutator-24 andwhich 70 2o trate the invention, Figure 1 is acentral lonwhen themachine is in motion generate a gitudinal section through amotor-generator current of different voltage from the current embodyingmy improvements, the arrangein the motor-circuit. This arrangement ofment of circuits being shown diagrammaticinotor-generatoris well knownand is usually ally. Fig. 2 is an end view of the direct-curemployed forconverting currents of high 75 25 rent side of the machine. Fig. 3 is asimilar potential into currents of low potential, and view of thealternating or pulsating current vice versa. Upon the shaft 14 andbetween side of the machine, and Fig. 4 is a perspecthe commutatorsecondary 24 and the rotary tive view of a portion of the field-frameand member or inductor b is arranged a pair of pole-pieces. insulatedrings 26 and 27, which are con- 80 Referring to the drawings, 1indicates a nected by circuits 28 and 29, respectively, to

circular field-frame having at one side a sediametrically oppositesections of the comriesof inwardly-projecting polepieces 2, 3, mutator18. It will be seen that by applying 1, 5, 6, and 7 and at the oppositeside of the brushes to these insulated rings a sinuous almachineacorresponding series of pole-pieces ternating current may be taken fromsaid 85 8, 9, 10, 11, 12, and 13. The machine shown rings, thisalternating current having a volinthedrawingsisasiX-polemachine,although tage equal to one-half the voltageof the moit may have any desired number of poles. tor-circuit. As shownin the drawings, wires Uponasuitably-journaled shaft 14c is mount- 30and 31 lead from the brushes upon the ed an armature a, arranged withinthe polecommutator 24 to switches 32, and wires 33 90 pieces 2 to- 7,inclusive, and upon the same and 34 lead from the insulated rings tosaid shaft is arranged an armature or inductor l) switches. 3y operatingthese switches direct within the pole-pieces 8 to 13, inclusive. Ascurrent from the secondary coils on the armashown, the armatures areboth grooved upon ture (b may be transmitted to the circuit 35, theirperipheries, the grooves 15 in the armawhich leads to the electrodes 15or points of 5 ture a, running parallel with the shaft and service, orthe alternating current from the the grooves 16 in the armature I) beingininsulated rings may be switched onto said clined. The pole-pieces 2 to7 are provided circuit, the switches being arranged so that with coils17, which are connected to a only one current source can be connected toprimary generator g, and the armature a, is the circuit 35 at one time.lVhile I have for I00 provided with a series of coils which areconconvenience shown two separate switches 32 nected to a commutator 18,the latter being in the drawings, it will be evident that in practicethe switch-arms would be brought together to form a double-pole switch.

It will be seen that by operating the rheostat 71, the speed of themotor will be varied. Hence the voltage in the secondary directcurrentcircuit will be correspondingly varied and the frequency in thealternating current will be varied. The currents thus derived may beused for a variety of purposes, such as cautery work, charging storagebatteries, or treating patients.

For the purpose of applying alternating or pulsating current to thepatient the second part of my apparatus is arranged as follows: Thepole-pieces 8 to 13 are wound with primary coils 36, which may beconnected by means of the switches 32 to either the secondarydirect-current circuit or the alternatingcurrent circuit, thus producingin said polepieces a constant field or an alternating field. Within thecircuit 37, which connects the field-coils 36, is arranged a regulatingdevice 38, having a variable ohmic resistance 39 and an inductiveresistance 4-0, either of which may be thrown into the circuit by meansof a lever ll. When the direct current is sent through the primary coils36, the magnetic strength of the pole-pieces S to 13 maybe varied bymoving the lever etl over the contact-points of the ohmic resistance,and when the alternating current is sent through said coils a movementof the lever in the opposite direction inserts inductive resistance,which regulates the volume of current flowing through said coils, andhence the magnetic strength of the pole-pieces. It will be noted thatthis variation in the strength of the alternating field will not beaccompanied by a change in frequency unless the speed of the motor ischanged.

The inductor or armature b is a metal body having the longitudinal slots16,Which divide the periphery of said body into a series of polarprojections 4.2. There is no winding upon thisinductor,itspurposebeingtovarythestrength of the field-poles as thepoles or projections 42 rotate past them. Upon the field-pieces 8 to 13,inclusive, are arranged a series of secondary coils 43, which are or maybe connected bysuitable switches L4; to thecircuit 35, leading to theelectrodes or point of service. It will be seen that when the sinuousalternating current is sent from the insulated rings through the primarycoils 30 a corresponding current will be generated in the secondarycoils A3 and transmitted to the electrode-circuit and that owing to therotation of the polar projections upon the inductor 1) past thefield-poles 8 to 13, inclusive, the sinuous current in the coils 43 willbe given a wavy or tremulous character, which will intensify the effect}upon the patient. Such a current gives the patient muscular exercisewithout exertion. By manipulating the rheostat h the frequency may bevaried,owin g to the change in speed, or, if desired, by operating theregulator 38 the voltage and current may be changed without changing thefrequency.

Instead of passing the alternating current. through the coils 36 theswitches 32 may be arranged to send the secondary direct eurrent throughsaid coils, thus producing a constant field in the poles S to 13,inclusive, which field is given a pulsating effect by the passage of thepolar projections upon the inductor Z). This variation in the magnetismof the pole-pieces produces a rapidly-alternating current ofcomparatively low intensity in the coils -13, which may be transmittedto the electrode-circuit. The frequency of the alternating current thusproduced is dependent upon the speed of the motor and the number ofprojections upon the inductor and may be varied by varying the speed ofthe motor, or its volume and potential. may be varied by means of theregulator 3 It will be seen from the above description that with asingle machine made according to my invention a number of currentsvaryin g in character may be derived and that the regulations offrequency, voltage, and volume of current is very readily effected. Ipreferably slot the poles 8 to 13, inclusive, as shown in Fig. Ifdesired, the insulated rings may be connected to the secondarycommutator 24iinstead of the commutator 18, although the latterarrangement is shown and preferred, except where the potential at thecommutator 1.8 is very high.

llaving thus described myinvention, what I claim, and desire to secureby Letters Patent, is-

1. In a motor-generator, an armature having a direct-cu rrent winding,and a commutator therefor, secondary direct-current windings, and acommutator to which said latter vindings are connected, insulated ringscarried by the armature-shaft and connected to opposite sections of oneof said commutators, an inductor upon the armature-shaft, fieldpolesopposite said inductor, primary and secondary field-coils upon saidpoles, an electrode-circuit connected to said secondary fieldcoils, anda switch arranged to connect said primary field-coils with the secondarycommutator or the insulated rings, as desired.

2. In a motor-generator, an armature having a direct-current winding anda commutator therefor, secondary direct-current windings and acommutator to which said latter windings are connected, insulated ringscarried by the armature-shaft and connected to opposite sections of oneof said commutators, an inductor upon the armature-shaft, field.- polesopposite said inductor, primaryand secondary field-coils upon saidpoles, an electrode-circuit connected to said secondary fieldcoils, aregulating device in the primary fieldcoil circuit adapted to vary theohmic or inductive resistance of the same, and a switch arranged toconnect said. primary field-coils with the secondary commutator or theinsulated rings as desired.

3. In a motor-generator, an armature having a direct-current winding,and a commutator therefor, secondary direct-current windings, and acommutator to which said latter windings are connected, insulated ringscarried by the armatureshaft and connected to opposite sections of oneof said commutators, an inductor upon the armature-shaft, fieldpolesopposite said inductor, primary and secondary field-coils upon saidpoles, an electrode-circuit connected to said secondary fieldcoils, aswitch arranged to connect said primary field-coils with the secondarycommutator or the insulated rings as desired, and means for varying thespeed of the motor.

4. In a motor-generator, an armature having a direct-current winding anda commutator therefor, secondary direct-current windings and acommutator to which said latter windings are connected, insulated ringscarried by the armature-shaft and connected to opposite sections of oneof said commntators, an inductor upon the armature-shaft, fieldpolesopposite said inductor, primary and secondary field-coils upon saidpoles, an electrode-circuit connected to said secondary fieldcoils, aregulating device in the primary fieldcoil circuit adapted to vary theohmic or inductive resistance of the same, a switch arranged to connectsaid primary field coils with the secondary commutator or theinsulatedrings as desired, and means for varying the speed of the motor.

5. In a motor-generator, an armature having a direct-current winding,and a coinmuta tor therefor, secondary direct-current windings, and acommutator to which said latter windings are connected, insulated ringscarried by the armature-shaft and connected to opposite sections of oneof said commutators, an inductor upon the armature-shaft, fieldpolesopposite said inductor, primary and secondary field-coils upon saidpoles, an electrode-circuit and switches arranged to connect saidelectrode-circuit with the secondary fieldcoils, the secondarycommutator or the insulated rings, as desired.

6. The combination with a motor-generator arranged to produce direct andalternating currents, of an inductor upon the armatureshaft of saidmotor-generator, said inductor having teeth or projections upon itsperiphery, field-poles opposite said inductor, primary and secondarywindings in inductive relation to one another upon said field-poles,means for passing either a direct or alternating current from said motorgenerator through the primary coils, a device arranged to insert eitheran inductive or ohmic resistance in said primary coils, and anelectrodecircnit connected to the secondary coils, and means for varyingthe speed of the motorgenerator.

In testimony whereof I affix my signature in presence of two witnesses.

PATRICK JOSEPH COLLINS.

lVitnesses:

WA'rsoN BROWNING, W. M. POINDEXTER.

